38 Unidrive M300/HS30 Quick Start Guide
Issue Number: 7
Defines which value of keypad control mode reference is displayed at power-up.
Defines the mode used by the ramp system.
0: Fast ramp
1: Standard ramp
2: Standard ramp with motor voltage boost
3: Fast ramp with motor voltage boost
Fast ramp is linear deceleration at programmed rate, normally used when a braking resistor is
installed.
Standard ramp is controlled deceleration to prevent DC bus over-voltage trips, normally used when
there is no braking resistor installed.
If a high motor voltage mode is selected, deceleration rates can be faster for a given inertia but motor
temperatures will be higher.
Setting Pr 29 to 0 allows the user to disable the ramps. This is generally used when the drive is
required to closely follow a speed reference which already contains acceleration and deceleration
ramps.
27 Power-up Keypad Control Mode Reference
RW Txt ND NC PT US
OL
Ú
rESEt (0), LASt (1), PrESEt (2)
Ö
rESEt (0)
RFC-A
Value Text Description
0 rESEt Keypad reference is zero
1 LASt Keypad reference is the last used value
2 PrESEt Keypad reference is copied from Preset Reference 1 (Pr 18)
28 Ramp Mode Select
RW Txt US
OL
Ú
Fast (0), Std (1), Std.bst (2),
Fst.bst (3)
Ö
Std (1)
RFC-A
29 Ramp Enable
RW Bit US
OL
Ú Ö
RFC-A Off (0) or On (1) On (1)
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